Not that that isn't good advice but there are benefits to using Aerith such as Seal Evil and that 3rd level Limit Break that tops off everyone's Limit Break meter at the cost of her own. Makes for grinding to level 4 much much easier (too bad you can't bench Cloud while doing this or it might actually be worth it to grind everybody like this).

@Yggdrasil Edit: OH GOD! IT'S FROM THE SAME GUY WHO DID THE PRIMARY DESIGNS FOR FE11!!!